Holdawayite
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About Holdawayite
Formula:
Mn6(CO3)2(OH)7(Cl,OH)
Hardness:
3
Crystal System:
Monoclinic
Name:
For US petrologist, Michael Jon Holdaway (b. 1936).
This page provides mineralogical data about Holdawayite.
Classification of Holdawayite
Approved
Approval Year:
1986
5/C.06-20
5.BA.20
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.2
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZq
11.12.2
11 : Carbonates
12 : Carbonates of Mn
11 : Carbonates
12 : Carbonates of Mn
Physical Properties of Holdawayite
Hardness:
3 on Mohs scale
Optical Data of Holdawayite
Type:
Biaxial (-)
RI values:
nα = 1.644 nβ = 1.719 nγ = 1.721
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Chemical Properties of Holdawayite
Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn2+6(CO3)2(OH)7(Cl,OH)
Crystallography of Holdawayite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell V:
1,203.67 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.93 | (100) |
| 7.77 | (40) |
| 5.459 | (80) |
| 3.879 | (70) |
| 2.926 | (40) |
| 2.690 | (60b) |
| 2.589 | (50b) |
Type Occurrence of Holdawayite
Synonyms of Holdawayite
Other Language Names for Holdawayite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 5.BA.05 | Azurite | Cu3(CO3)2(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Georgeite | Cu2(CO3)(OH)2 · 6H2O | Amor. |
| 5.BA.10 | Glaukosphaerite | (Cu,Ni)2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Kolwezite | (Cu,Co)2(CO3)(OH)2 | Tric. |
| 5.BA.10 | Malachite | Cu2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Mcguinnessite | (Mg,Cu)2(CO3)(OH)2 | |
| 5.BA.10 | Nullaginite | Ni2(CO3)(OH)2 | Mon. |
| 5.BA.10 | Pokrovskite | Mg2(CO3)(OH)2 | Mon. |
| 5.BA.10 | Rosasite | (Cu,Zn)2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.10 | Zincrosasite | (Zn,Cu)2(CO3)(OH)2 | Mon. |
| 5.BA.10 | Chukanovite | Fe2+2(CO3)(OH)2 | Mon. 2/m : P21/b |
| 5.BA.15 | Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 | Mon. 2/m : P21/m |
| 5.BA.15 | Hydrozincite | Zn5(CO3)2(OH)6 | Mon. 2/m : B2/m |
| 5.BA.25 | Defernite | Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5) | Orth. mmm (2/m 2/m 2/m) : Pnma |
| 5.BA.25 | UM1977-03-COSiO:CaClH | Ca10-11(CO3)7(SiO4)Cl1-2(OH)1-2 | Mon. |
| 5.BA.30 | Loseyite | (Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10 | Mon. 2/m |
| 5.BA.30 | Sclarite | (Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10 | Mon. 2/m : B2/b |
Related Minerals - Dana Grouping (8th Ed.)
| 16b.4.2.1 | Defernite | Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5) | Orth. mmm (2/m 2/m 2/m) : Pnma |
Related Minerals - Hey's Chemical Index of Minerals Grouping
| 11.12.1 | Rhodochrosite | MnCO3 | Trig. 3m (3 2/m) : R3c |
| 11.12.3 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O | Trig. 3m (3 2/m) |
| 11.12.4 | Kutnohorite | CaMn2+(CO3)2 | Trig. 3 : R3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Holdawayite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 37: 637-642.
American Mineralogist: 73: 632-643.
Internet Links for Holdawayite
mindat.org URL:
https://www.mindat.org/min-1919.html
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Localities for Holdawayite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany | |
| Wittern: "Mineralfundorte in Deutschland", 2001 |
| Der Aufschluss Vol.55, March/April 2004 |
Namibia (TL) | |
| American Mineralogist (1988): 73: 632-642. |
Romania | |
| http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20. |
Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia